Description of problem:

Changing the resolution is system-config-display does not change the resolution
of the X server.

Version-Release number of selected component (if applicable):

system-config-display-1.0.45-

Steps to Reproduce:
1. Run system-config-display
2. Change display size from 1600x1200 to 1280x800
3. Press OK
4. Log out and log in
  
Actual results:

The display size stays the same.  The /etc/X11/xorg.conf has no mention of the
display size.

Expected results:

The display size changes.  The Display SubSection with the desired mode is
written to /etc/X11/xorg.conf.

I had to manually add:

        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x800" "1024x768" "800x600" "640x480"
        EndSubSection

S-c-d did detect the 1280x800 after the manual change.  But it would still not
change the resolution.